The short answer is that while there are still engineering resources focused on future platform offerings that build off Quad FX, the current energy and effort has gone into programs and product initiatives like “Spider” and AMD has discontinued future planning and development of its eight-core enthusiast platform at this time. We will continue to support customers that have an existing Quad FX with DSDC and are also working on an upgrade path for those customers.

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Enough said, everything is now in the hands of AMD's "Spider" platform powered by up to four video cards and native quad-core Phenom processors.

I think this is a good move. AMD created some hype with this platform, but the real implementation of such a complicated setup is unnecessary with today's advancements, at least in my opinion. by the time AMD could fine-tune and ship this platform, we will have 1-socket 8-cores parts (hopefully). no need to go SERVER

Socket-AM2+ motherboards, most of which are based on AMD's new 790FX chipset, were supposed to bring a tangible performance increase when paired with a Phenom processor. Phenom's L3 cache and North Bridge work on the same power plane, one separate from the rest of the CPU. Socket-AM2+ enables the use of two separate voltages, one for the L3 cache/NB and one for the rest of the CPU, whereas Socket-AM2 motherboards run the entire chip at the same voltage. The original plan was for Socket-AM2+ motherboards to run the L3 cache/NB at a higher frequency than the rest of the chip, unfortunately it looks like AMD wasn't able to make that happen.

Currently, the L3 cache/NB on these chips runs at a fixed frequency that's actually lower than the rest of the CPU frequency: 2.0GHz. We tested Phenoms running from 2.2GHz all the way up to 2.6GHz, and in all cases the L3 cache and North Bridge ran at 2.0GHz. We're not sure if this will ever get fixed, but it's somewhat disappointing as it was supposed to be a major reason for upgrading to Socket-AM2+ (but it's good news for current AM2 owners).

I still wonder why this issue hasn´t been really faced in the forums...
People are arguing about next step´s technologies not having in mind that even the current technology isn´t working the way it should.

damn what took them so long, that thing was a dissaster from the get go. lol (quad fx is not to be confused with the amd quad core cpu(barcelon or phenom), quad fx is two fx class dual cores on a dual socket 1207 motherboard)